CVE-2009-1958: Strongswan

Medium severity, CVSS 5.0. EPSS: 2.9% chance of exploitation in the next 30 days.

charon/sa/tasks/child_create.c in the charon daemon in strongSWAN before 4.3.1 switches the NULL checks for TSi and TSr payloads, which allows remote attackers to cause a denial of service via an IKE_AUTH request without a (1) TSi or (2) TSr traffic selector.

Affected products

• Strongswan Strongswan: up to and including 4.2.9; version 2.0.0 only; version 2.0.1 only; version 2.0.2 only; version 2.1.0 only; version 2.1.1 only; …

Published 2009-06-08. Last modified 2026-06-16.